Serially connected Bi-direetional DFE suitable for 8-VSB modulation

Dong Seog Han

doi:10.1109/TBC.2005.857601

Serially connected Bi-direetional DFE suitable for 8-VSB modulation

Dong Seog Han

School of Electronics Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A serially connected bi-directional decision feedback equalizer (SB-DFE) is proposed to improve the performance of channel equalization by exploiting implicit multipath diversity. The SB-DFE improves equalization performance by cascading normal and time-reversed DFEs. Conventional bi-directional DFEs obtain improved performance by combining the two DFEs in parallel. They, however, need accurate channel estimation and the performance is not guaranteed for multi-level modulation because they utilize each DFEs hard decided output symbols. On the other hand, the SB-DFE utilizes the soft output of the normal DFE at the first DFE as the input to the following time-reversed DFE without channel estimation. The performance of the SB-DFE is compared with that of the normal DFE and the bi-directional arbitrated DFE (BAD) in the 8-level vestigial sideband (8-VSB) modulation system with Brazilian digital high-definition television (HDTV) test channels. The SB-DFE has 1 - 1.8 dB signal-to-noise ratio (SNR) gains over the others.

Original language	English
Pages (from-to)	45-49
Number of pages	5
Journal	IEEE Transactions on Broadcasting
Volume	52
Issue number	1
DOIs	https://doi.org/10.1109/TBC.2005.857601
State	Published - Mar 2006

Keywords

Adaptive equalizers
Decision feedback equalizers
HDTV

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10.1109/TBC.2005.857601

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title = "Serially connected Bi-direetional DFE suitable for 8-VSB modulation",

abstract = "A serially connected bi-directional decision feedback equalizer (SB-DFE) is proposed to improve the performance of channel equalization by exploiting implicit multipath diversity. The SB-DFE improves equalization performance by cascading normal and time-reversed DFEs. Conventional bi-directional DFEs obtain improved performance by combining the two DFEs in parallel. They, however, need accurate channel estimation and the performance is not guaranteed for multi-level modulation because they utilize each DFEs hard decided output symbols. On the other hand, the SB-DFE utilizes the soft output of the normal DFE at the first DFE as the input to the following time-reversed DFE without channel estimation. The performance of the SB-DFE is compared with that of the normal DFE and the bi-directional arbitrated DFE (BAD) in the 8-level vestigial sideband (8-VSB) modulation system with Brazilian digital high-definition television (HDTV) test channels. The SB-DFE has 1 - 1.8 dB signal-to-noise ratio (SNR) gains over the others.",

keywords = "Adaptive equalizers, Decision feedback equalizers, HDTV",

author = "Han, {Dong Seog}",

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AB - A serially connected bi-directional decision feedback equalizer (SB-DFE) is proposed to improve the performance of channel equalization by exploiting implicit multipath diversity. The SB-DFE improves equalization performance by cascading normal and time-reversed DFEs. Conventional bi-directional DFEs obtain improved performance by combining the two DFEs in parallel. They, however, need accurate channel estimation and the performance is not guaranteed for multi-level modulation because they utilize each DFEs hard decided output symbols. On the other hand, the SB-DFE utilizes the soft output of the normal DFE at the first DFE as the input to the following time-reversed DFE without channel estimation. The performance of the SB-DFE is compared with that of the normal DFE and the bi-directional arbitrated DFE (BAD) in the 8-level vestigial sideband (8-VSB) modulation system with Brazilian digital high-definition television (HDTV) test channels. The SB-DFE has 1 - 1.8 dB signal-to-noise ratio (SNR) gains over the others.

KW - Adaptive equalizers

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Serially connected Bi-direetional DFE suitable for 8-VSB modulation

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Keywords

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